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Using ReadItemValue with OpcLabs.EasyOpcClassic.dll under WPF access issue

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28 Jul 2015 04:20 #3464 by support
This is an extension method, which I think is located in the IEasyDAClientExtension class in the EasyOpcClassicInternal assembly (cannot check that at the moment).

It is basically a thin wrapper over ReadMultipleItemValues, implemented as a static method in a static class, and taking any IEasyDAClient (including EasyDAClient) as the first argument.

Let me know if you need more info.
Best regards

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28 Jul 2015 01:12 #3463 by pgilbert
Hello, while using the version 5.34.274.1 of OpcLabs.EasyOpcClassic.dll our interpreted language cannot reach the ReadItemValue method that is supposed to be in the namespace OpcLabs.EasyOpc.DataAccess.EasyDAClient . However the ReadMultipleItems and ReadMultipleItemValue are accessible.

Inspecting the assembly with Telerik JustDecompile confirms that the method ReadItemValue is not part of that namespace. I must say that the Visual Studio example is working:
using System.Windows;
using OpcLabs.EasyOpc.DataAccess;
 
namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
 
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            var client = new EasyDAClient();
            var value = client.ReadItemValue("", "OPCLabs.KitServer.2", "Demo.Single");
            TextBox1.Text = (value== null) ? "" : value.ToString();
        }
    }
}

Question: What does need to be done to access that method when not using Visual Studio or alternatively where is it located ?

Thanks in advance,

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